<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>while实现1到100相加求和</title>
    <script>
        var a = 1
        var sum = 0
        while (a <= 100) {
            sum += a
            a++
        }
        alert('1-100相加的和是：' + sum)
    </script>
</head>

<body>

</body>

</html>